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Electrochemical oxidation of olive oil mill wastewaters

Elefteria Psillakis, Marina Gotsi, Nicolas Kalogerakis, Petros Samaras, Dionissios Mantzavinos

Πλήρης Εγγραφή

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Περίληψη

The electrochemical oxidation of olive oil mill wastewaters over a titanium–tantalum–platinum–iridium anode wasinvestigated. Batch experiments were conducted in a flow-through electrolytic cell with internal recycle at voltage of 5, 7and 9V, NaCl concentrations of 1%, 2% and 4%, recirculation rates of 0.4 and 0.62 L/s and initial chemical oxygendemand (COD) concentrations of 1475, 3060, 5180 and 6545 mg/L. The conversion of total phenols and COD as well asthe extent of decolorization generally increased with increasing voltage, salinity and recirculation rate and decreasinginitial concentration. In most cases, nearly complete degradation of phenols and decolorization were achieved at shorttreatment times up to 60 min; this was accompanied by a relatively low COD removal that never exceeded 40% evenafter prolonged (up to 240 min) times. The consumption of energy per unit mass of COD removed after 120 min oftreatment was found to be a strong function of the operating conditions and was generally low at high initialconcentrations and/or reduced salinity. The acute toxicity to marine bacteria Vibrio fischeri decreased slightly duringthe early stages of the reaction and this was attributed to the removal of phenols. However, as the reaction proceededtoxicity increased due to the formation of organochlorinated by-products as confirmed by GC/MS analysis. Thetoxicity to Daphnia magna increased sharply at short treatment times and remained quite high even after prolongedoxidation.

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